<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let str = '123'
        let num = 1
        let obj = {}
        let arr = []
        let nul = null
        let fal = false
        let nu
        let fu = () =>

        console.log(typeof str);
        console.log(typeof num);
        console.log(typeof obj);
        console.log(typeof arr);
        console.log(typeof nul);
        console.log(typeof fal);
        console.log(typeof nu);
        console.log(typeof fu);
    </script>
</body>

</html>